transfer fuctions in script

[Nugget_Mon]

Hello,
I am trying to write a controls circuit script. When I call the script form
the terminal, I get an error saying that the number of poles is less than
the number of zeros. However, if I type the transfer function in from the
command line, Octave accepts it. Is there something I am missing? I have not
done anything other that to define the functions.

octave:9> test1

error: # of poles (0) < # of zeros (1)
error: evaluating if command near line 79, column 3
error: called from `tf' in file
`/usr/share/octave/3.0.0/m/control/system/tf.m'
error: evaluating assignment expression near line 6, column 5
error: near line 6 of file `~/octave/test1.m'

The script is:
Gp=tf([1],[1,0.5,4],0,"plant_input","plant_output");
Gc_1=tf([21],[1],0,"controller_input","controller_output");
Gc_2=tf([8,21],[1],0,"controller_input","controller_output");

I am using:
GNU Octave, version 3.0.0 "x86_64-pc-linux-gnu"

GNU Emacs 22.1.1 (x86_64-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2008-05-02 on king, modified by Ubuntu

Ubuntu 8.04

Thanks,
-Mon
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